Jerry Nease Phones & Addresses
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4024 Cantwell Valley Rd, Sneedville, TN 37869 (423) 733-8921
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Wilmington, NC
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Rocky Point, NC
Publications
Us Patents
Method For Measuring Diameters Of Non-Circular Fibers
View pageUS Patent:
52836282, Feb 1, 1994
Filed:
Dec 31, 1991
Appl. No.:
7/816491
Inventors:
Jerald B. Dotson - Los Angeles CA
Jerry D. Nease - Wilmington NC
Bruce W. Reding - Elmira NY
Jerry D. Nease - Wilmington NC
Bruce W. Reding - Elmira NY
Assignee:
Corning Incorporated - Corning NY
International Classification:
G01B 902
US Classification:
356355
Abstract:
A method for measuring the diameter of a transparent filament is provided which is substantially insensitive to ellipticity of the filament. The method comprises using an interference technique to measure the filament diameter at two locations which are spaced apart by an amount such that a plot of diameter versus angle of rotation for an elliptical filament calculated at the first location is approximately 90. degree. out of phase from the same plot calculated at the second location. Due to the phase difference, the average of the two measurements is substantially insensitive to ellipticity. For measurement apparatus comprising one laser and two detectors and for optical waveguide fibers having a cladding composed of fused silica, the two locations can be about 123. degree. apart. In other embodiments, a method for characterizing the non-circularity of a filament is provided. Apparatus for practicing the foregoing methods is also disclosed.